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import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreePath;
import java.awt.*;
import java.util.Objects;

/*
 * @test
 * @summary regression test for JBR-9365 Unnecessary operations on tree node update
 */

public class NodeUpdatePerformance {
    private static int countBefore;
    private static int countAfter;

    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeAndWait(() -> {
            DefaultMutableTreeNode root = new DefaultMutableTreeNode();
            DefaultMutableTreeNode child = new DefaultMutableTreeNode();
            root.add(child);
            DefaultTreeModel model = new DefaultTreeModel(root);
            JTree tree = new JTree(model);
            tree.setRowHeight(10);
            tree.setLargeModel(true);
            OurRenderer renderer = new OurRenderer();
            tree.setCellRenderer(renderer);

            countBefore = renderer.invocationCount;
            model.valueForPathChanged(new TreePath(child.getPath()), "newValue");
            countAfter = renderer.invocationCount;
        });
        if (countBefore != countAfter) {
            throw new RuntimeException("Unexpected renderer access: countBefore=" + countBefore + ", countAfter=" + countAfter);
        }
    }

    private static class OurRenderer extends JLabel implements TreeCellRenderer {
        private int invocationCount;

        @Override
        public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
            invocationCount++;
            setText(Objects.toString(value));
            return this;
        }
    }
}